Ovarian hyperstimulation syndrome
What is Ovarian hyperstimulation syndrome?
Ovarian hyperstimulation syndrome is a medical condition that can develop when fertility medications overstimulate the ovaries. These medications are used during assisted reproductive technology treatments like in vitro fertilization. The ovaries become swollen and painful as they release too many eggs at once.
In mild cases, the symptoms are uncomfortable but resolve on their own within a few days. Severe cases can cause fluid to build up in the abdomen and chest. This can lead to serious complications like blood clots, kidney problems, and breathing difficulties. Most cases are mild, but about 1 to 2 percent of women undergoing fertility treatment develop the severe form.
The condition typically develops within a week after receiving hormone injections during fertility treatment. Early recognition and monitoring are important for preventing complications. Women at higher risk include those with polycystic ovary syndrome, those under age 35, and those who have had the condition before.
Symptoms
- Mild to severe abdominal pain and bloating
- Nausea and vomiting
- Rapid weight gain, often 5 to 10 pounds in just a few days
- Swelling in the abdomen or belly area
- Decreased urination despite drinking fluids
- Shortness of breath or difficulty breathing
- Dizziness or lightheadedness
- Tender or enlarged ovaries
Symptoms usually appear within 7 to 10 days after hormone injections for fertility treatment. Mild symptoms may resolve on their own, but severe symptoms require immediate medical attention. If you experience trouble breathing, severe abdominal pain, or persistent vomiting, seek emergency care right away.
Concerned about Ovarian hyperstimulation syndrome? Check your levels.
Screen for 1,200+ health conditions
Causes and risk factors
Ovarian hyperstimulation syndrome is caused by fertility medications that stimulate the ovaries to produce multiple eggs. The main culprit is human chorionic gonadotropin, a hormone given as an injection to trigger ovulation. This hormone causes the ovaries to release chemicals that make blood vessels leak fluid into the abdomen. Women with polycystic ovary syndrome are at higher risk because their ovaries may overreact to fertility drugs. Other risk factors include being under 35 years old, having low body weight, and having high estrogen levels during treatment.
The condition is more likely to occur when a woman becomes pregnant during the treatment cycle. Pregnancy naturally increases hormone levels, which can worsen the syndrome. Using higher doses of fertility medications also increases risk. A history of ovarian hyperstimulation syndrome in previous fertility cycles makes future episodes more likely. Some genetic factors may make certain women more susceptible to developing this condition.
How it's diagnosed
Doctors diagnose ovarian hyperstimulation syndrome based on symptoms, medical history, and physical examination. An ultrasound can show enlarged ovaries and fluid buildup in the abdomen. Blood tests may check for elevated hormone levels, kidney function, and electrolyte imbalances. These tests also measure how concentrated your blood is, which helps assess dehydration.
Because this condition develops specifically from fertility treatment, your reproductive endocrinologist will monitor you closely during treatment cycles. They may perform frequent ultrasounds and blood tests to track how your ovaries respond to medications. If you develop concerning symptoms after fertility treatment, contact your doctor immediately for evaluation. Talk to our doctor about testing options and monitoring during fertility treatment.
Treatment options
- Rest and avoid strenuous physical activity until symptoms improve
- Drink plenty of fluids to stay hydrated, especially electrolyte drinks
- Avoid sexual intercourse until symptoms resolve to prevent ovarian rupture
- Take pain relievers like acetaminophen, but avoid ibuprofen and aspirin
- Monitor weight daily and report rapid gains to your doctor
- Hospitalization for severe cases to receive intravenous fluids and monitoring
- Drainage of excess abdominal fluid if breathing becomes difficult
- Blood thinners to prevent clots in serious cases
Frequently asked questions
Mild cases typically resolve within a week or two without treatment. Moderate cases may take 2 to 3 weeks to improve. If pregnancy occurs during the treatment cycle, symptoms can last several weeks longer. Severe cases requiring hospitalization usually improve within 7 to 10 days with proper medical care.
Your fertility doctor can take steps to reduce your risk during treatment. These include using the lowest effective dose of fertility medications and carefully monitoring your response with blood tests and ultrasounds. Some doctors may recommend freezing embryos and delaying transfer to a later cycle. Certain medications like cabergoline may help prevent severe cases in high-risk women.
Most cases are mild and uncomfortable but not dangerous. However, severe cases can lead to serious complications like blood clots, kidney failure, and fluid in the lungs. In very rare cases, it can be life-threatening. This is why close monitoring during fertility treatment is so important.
Yes, many women with this condition do become pregnant during the same treatment cycle. In fact, pregnancy can make symptoms worse because it increases hormone levels. Your doctor will help you balance the goal of pregnancy with managing your symptoms safely. In severe cases, embryo transfer may be postponed to a future cycle.
Seek emergency care if you have severe abdominal pain, persistent vomiting that prevents you from keeping down liquids, little to no urination, or difficulty breathing. Sudden weight gain of more than 10 pounds in 3 days is also concerning. Chest pain, severe leg swelling, or confusion requires immediate medical attention.
Women under 35 years old are at higher risk, especially those with polycystic ovary syndrome. Having a low body mass index also increases risk. Women who have had ovarian hyperstimulation syndrome in previous fertility cycles are more likely to develop it again. High estrogen levels during treatment and using higher medication doses also raise your risk.
Most cases are mild and can be managed at home with rest and fluids. About 1 to 2 percent of women develop severe cases requiring hospitalization. You may need hospital care if you have severe pain, vomiting, rapid weight gain, or difficulty breathing. Hospitalization allows doctors to give intravenous fluids and monitor for complications.
Blood tests help monitor your risk and severity during fertility treatment. Doctors check hormone levels like estrogen and luteinizing hormone to see how your ovaries respond to medications. Blood tests also measure kidney function, electrolytes, and blood cell counts. These tests help your doctor catch problems early and adjust treatment as needed.
Contact your fertility doctor immediately if you develop symptoms during treatment. They will evaluate your condition and decide whether to adjust medications or pause treatment. Never stop medications on your own without medical guidance. Early intervention can prevent mild cases from becoming severe while still preserving your chance of pregnancy.
Drink 10 to 12 glasses of electrolyte drinks daily to stay hydrated. Weigh yourself every morning and keep a log. Rest as much as possible and avoid heavy lifting or strenuous exercise. Eat small, frequent meals if you feel nauseated. Sleep with your upper body elevated if you have mild breathing discomfort.